SQL Concat，php

Question

这是我的代码

$this->db->select('*, CONCAT(left(card_id, 1 ), right(card_id, 6 )) AS character_id', FALSE);

错误： 遇到错误

Unknown column '1' in 'field list'

请帮帮我!!!

Answer 1

似乎您忘了指定您的表名。

请将[tablename]替换为您的表格名称：

$this->db->query('SELECT *, CONCAT(left(card_id, 1 ), right(card_id, 6 )) AS character_id FROM [tablename]');

或：

$this->db->select("*, CONCAT(left(card_id, 1 ), right(card_id, 6 )) AS character_id");
$this->db->from("[tablename]");
$res = $this->db->get();

Answer 2

试试这种方式

$this->db->select("*, CONCAT(left(card_id, 1 ), right(card_id, 6 )) AS character_id",FALSE);
$this->db->from("table");
$query = $this->db->get();
return $query;